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The pair will make their first appearance when the reality competition's live rounds kick off in November. "The worst kept secret in Hollywood is out," said producer/judge Simon Cowell in a statement. "Mario and Khloé are our hosts. They will debut on our first live show in November and I couldn't be happier."

"I'm so thrilled to become a part of 'The X Factor' family," said Odom. "I've been a big fan of the show and look forward to working with Simon and all of the judges. It's going to be so much fun!"

"I'm very excited to be joining 'The X Factor' team," said Lopez. "I love the show, and I've been a big fan of Simon Cowell and the judges for a long time. Khloé and I have been friends for years and I know we'll be a great team and have a blast."